Przewalski's horse (Equus przelwalskii)
Once abundant as far back as the last Ice Age, the Przwalski’s horse is the only true wild horse. The same species as domestic and feral horses, it is genetically distinct, with 66 chromosomes instead of the 64 found in other horses. This small, stocky horse with a pale coat and erect mane once lived in plains and hills with an elevation of 2,500 m (8,202 ft).

Since 1879, the number of Przewalski’s horses has declined significantly due to hunting and loss of grazing and watering sites by domestic animals. It disappeared in the wild by the late 1960s. However, thanks to zoo breeding programs, a number of these rare ungulates have been released in Mongolia over the past decade, with hopes of establishing a stable population in the wild.